John t



` To all whom t may concern.: l

\ i ffBe it known `that I,Jo1n T. BRUEN, of 1the'city, county, andStateof New `York, `have invented certain Improvements in Sawthefigures.: y y The` section `ofi the saw plate as repre-` sented in the`accompanying drawing is se- "cured in the crossheadfof the saw frame by"f1 a hook (d) in the ordinary manner to which reciprocating motion` isgiven by means of` "a crank or other machinery. The body of lthe sawplate (at) Visformed of woven wire `or metal strips, thecross wires ofwhich are made to sustain a metal strip (b) with a corrugated edge,which is firmly secured' at one l fend" tothe clamp, and at the otherend is ystrained by a pin (c) socketed into the hook fiand held by aclamp nut as shown in the f drawing.,` Bythis means the cutting edge canbe `readily renewed when necessary. The warpisfso `protectedby means ofthe y corrugated llingeor cross wires as to `be out ofreach ofwear, andthe kerf formed by "the edge, or the `corrugated `metal strip (b)issuiiciently wide toyprevent undue friction onthesides of thesaw plate.

Atmodificationof this device is `shown in Fig; 3 at1(a1 a) representingblocks of lead.

JOHN T. zBrtUnN,` or NnwYonK, N. Y.

7 Sirona Ann MARBLE SAW. l

l i. Specification of Letters Patent No.` 12,813, dated May 8, 1855.

`Platesfor Sawing Stones, &c., in the operawtionof which `it isimportant that the saw j be properly suppliedwith sand and water,*(forwell known reasons!)` and to facilitate `the free Ipercolation ofthis gritty medium" under the edge `of the saw-plate' is `the :de-

` sideratum in the operation of sawing stone.` UThisI have `accomplishedby means of a weve or `waved body of` a saw-plate. .The "followingis afull and exact description "thereof, reference being `hadto the accom`Ipanying drawings, making part of this lffspecilication, in whiche- 1.il vie`w.` `1 Fig. `3, representation @ofthe modi ffication hereinafterdescribed wherein lead `is used." Y

`The same letters indicate like` parts in `all with spaces between, oraband of lead, withl l indentationsffw cv) at intervals on the sides Cand edge, attached to edge of the woven blade as at (bf 12') Fig. 8, soas to freely admit `the"sand,"c;,and bring itdown at l "once upon thepoint to be cut,\by` which a "much greater effect `is; produced thanybyany known inode. These devices are strained by hoops and frames, andused in the ordinary way, by any of the machines now operatingwithoutany change but the saw blades.

The warp of which the body of the saw `plate is composed I secure at oneend in any appropriate manner, and proceed in lling thesamewith'corrugated cross wires to any required length. I then take the two`end plates (m) the inner surface of which is channeled crosswise like arasp, and place one on each side' of the `saw plate, thus forming aclamp which when riveted or otherwise -held together, will rmly hold thewarp, which may be turned or twisted in the groove formed at the end ofthe clamp, (g) Fig. 2, and at (r) Fig. l, to prevent the possibility ofbeing drawn out when stretchedby the hook (d). i

. I contemplate another` modification of my device by corrugating thesaw blade in such a manner asto admit the free passage of `the grit onthe sides, the sharp angles of which will be protected in theindentations ing the corrugation.

I do not wish to confine myself to the preoise mode of application ordevices above described, whichmay bevaried, according to circumstancesand experience.

Having thus fully described my improved saw plate, for cutting stone, Ido not claim the using of sand and water or other grit with a plainmetal plate as new, nor the blade with grooves cut in it: but

What I do claim as my invention, and for which I desire to secureLetters Patent isl. The making of the body of the sawv plate,- of wovenwire or strips of metal, or any analogous device for the purpose of ad-`mitting the free passage of the grit in the operation of sawing stone,substantially and for the purpose as herein described.

2. I also claim in combination with the both its sides through theindentations as abovedthe waved cutting edge, o; any analoabove setforth. gousevce substantiall and or the purpose hereindeseribed. y JOHNT BRUEN' 3. I also claim forming the edges of the Witnesses: saw bladethicker than to central portion so THos. E. WARREN, as to admit the freepassage of the grit on L. E. HOPKINS.

